Great Lakes Spa Center has been selling Great Lakes spas, hot tubs, and parts since 1985. They are a family-owned business with an interest in making the purchase of a hot tub an enjoyable. experience. Their service department has completed all of their training directly from the manufacturers. They maintain a complete inventory of parts, manuals, and wiring diagrams for the Great Lakes spa, IST/Spa Tech spas, and Almost Heaven saunas.